From: NeilBrown <neilb@suse.de>
Date: Fri, 19 Sep 2008 01:49:54 +0000 (+1000)
Subject: md: Don't wait UNINTERRUPTIBLE for other resync to finish
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9744197c3d7b329590c2be33ad7b17409bd798fe;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

md: Don't wait UNINTERRUPTIBLE for other resync to finish

When two md arrays share some block device (e.g each uses different
partitions on the one device), a resync of one array will wait for
the resync on the other to finish.

This can be a long time and as it currently waits TASK_UNINTERRUPTIBLE,
the softlockup code notices and complains.

So use TASK_INTERRUPTIBLE instead and make sure to flush signals
before calling schedule.

Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 4790c83d78d0..deeac4b44173 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5761,7 +5761,11 @@ void md_do_sync(mddev_t *mddev)
 					 * time 'round when curr_resync == 2
 					 */
 					continue;
-				prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
+				/* We need to wait 'interruptible' so as not to
+				 * contribute to the load average, and not to
+				 * be caught by 'softlockup'
+				 */
+				prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
 				if (!kthread_should_stop() &&
 				    mddev2->curr_resync >= mddev->curr_resync) {
 					printk(KERN_INFO "md: delaying %s of %s"
@@ -5769,6 +5773,8 @@ void md_do_sync(mddev_t *mddev)
 					       " share one or more physical units)\n",
 					       desc, mdname(mddev), mdname(mddev2));
 					mddev_put(mddev2);
+					if (signal_pending(current))
+						flush_signals(current);
 					schedule();
 					finish_wait(&resync_wait, &wq);
 					goto try_again;